Any one know what this is it’s from a mig welder

 

Looks like a green thing on someones shorts!
Max.

 

 

1. Found this broken off in the bottom of mig welder I recently purchased,

 

This is a resistor. Can you take a better picture of the markings on it. It should be relatively easy to replace.

 

1. Found this broken off in the bottom of mig welder I recently purchased,

This is a resistor. Can you take a better picture of the markings on it. It should be relatively easy to replace.

 

I’m sorry Gary, but the lettering is not in focus. You notice how sharp the leg is? That’s what we need the letters to look like. Focus on that. Usually it doesn’t matter as much but the lettering on that is ambiguous and hard to decipher.

 

38 ohms 20% what it looks like ohm it out
It doesnt look burnt or broke

 

Looks like

200M+5%

That's a very large resistor. If it IS 200 MEG Ω that's a whole lot of resistance for a welder that may typically put out 24 volts. If so (and I'm convinced I'm wrong) that would be (24÷200000=)000012 (120µA). 120µA x 24 = 0.00288 watts. That resistor looks like at least a 5 watt resistor, possibly 10 watts, maybe even 20 watts. A real clear picture of the markings would help us determine its exact value. My guess, being that it's such a high wattage resistor the resistance has to be pretty low. Perhaps it's 20Ω. In that case that calc's out at 28.8 watts. Without size reference we can only guess as to the wattage rating of the resistor. It may be a 30 watt, may be a 50 watt. Being of a ceramic body with a vent hole through the middle, it's a pretty high wattage resistor for sure. Got to be more than 10 watts. But that's all just guesswork here.

 

Marked 20 Ohm, wire wound resistor 20 watts.
Edit:
Value correction.
Max.

 

Many welders operate on 24 volts. Assuming this voltage, 24 volts divided by 2 ohms equals 12 amps. 12 amps times 24 volts equals 288 watts. I'm finding that difficult to reconcile. 20 ohms on the other hand comes to 28.8 watts. A 30 watt resistor might just burn the legs off as this one appears to be. 50 watts should be able to handle the current.

Even if the welder only operated on 12 volts, that's still 144 watts. Far above 20 watts. Unless this resistor is for something entirely different. Maybe current sensing on the stinger. Maybe it's operating on 5 volts. In that case; 5 volts divided by 2 ohms equals 2.5 amps. That times 5 volts equals 12.5 watts.

OK, I think I convinced myself that this CAN be 2 ohms. However, it stands to reason we need more information to come to an accurate assessment of the component.

 

Any idea where it came off of? Since it doesn't look damaged (except maybe a lef) please take a meter reading to get resistance value. My guess is that it's a bleeder resistor for the caps. Prob 200 Ohms at 20-30 watts.

BTW - if it is the bleed resistors be careful with that (those) huge caps (50,000-250,000 uF). They may be charged and dangerous.

 

I’m sorry Gary, but the lettering is not in focus. You notice how sharp the leg is? That’s what we need the letters to look like. Focus on that. Usually it doesn’t matter as much but the lettering on that is ambiguous and hard to decipher.

 

Any better for you

 

can you check the resistance with a meter?

 

It's much better. Do you have a DMM? Can you check the resistance? It doesn't look damaged, it should read properly.

 

Looks like a green thing on someones shorts!
Max.

Alien probe?

 

Any better for you

The printing on it isn't great - but I'd hazard a guess at 2 or300 milli-Ohm.

 

I see 200 meg, plus or minus 5% post #13, 3rd picture to the right.

kv

 

Also, if you can find a schematic of the welder would be good. I've looked everywhere and can't seem to find anything like it.

kv